// 引入fs模块
const fs = require('fs');
let username = 'Pony Ma';
let pwd = 666666;
let content = {
  username,
  pwd
}
/*
fs.writeFile('./a.txt', 'hello node', err => {
    if (err) {
        throw err
    } else {
        console.log('操作完成！');
    }
})*/

fs.writeFile('./pony.json', JSON.stringify(content), err => {
    if(err) {
      throw err
    }else {
      console.log('操作完成！');
      fs.readFile('./pony.json', 'utf8', (err, data)=> {
        if(err) {
          throw err
        }else {
          let res = JSON.parse(data);
          if(username == res.username && pwd == res.pwd) {
            console.log('登陆成功！');
          }else {
            console.log('用户名或密码错误！');
          }
        }
      })
    }
  })

/*
let realName = 'Jack';
let person = {
    realName
}
console.log(666, person.realName);
*/